/usr/share/openscad/libraries/MCAD/teardrop.scad is in openscad-mcad 2014.03-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | /* From http://www.thingiverse.com/thing:3457
© 2010 whosawhatsis
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
This script generates a teardrop shape at the appropriate angle to prevent overhangs greater than 45 degrees. The angle is in degrees, and is a rotation around the Y axis. You can then rotate around Z to point it in any direction. Rotation around X or Y will cause the angle to be wrong.
*/
module teardrop(radius, length, angle) {
rotate([0, angle, 0]) union() {
linear_extrude(height = length, center = true, convexity = radius, twist = 0)
circle(r = radius, center = true, $fn = 30);
linear_extrude(height = length, center = true, convexity = radius, twist = 0)
projection(cut = false) rotate([0, -angle, 0]) translate([0, 0, radius * sin(45) * 1.5]) cylinder(h = radius * sin(45), r1 = radius * sin(45), r2 = 0, center = true, $fn = 30);
}
//I worked this portion out when a bug was causing the projection above to take FOREVER to calculate. It works as a replacement, and I figured I'd leave it here just in case.
/*
#polygon(points = [[radius * cos(-angle / 2), radius * sin(-angle / 2), 0],[radius * cos(-angle / 2), radius * -sin(-angle / 2), 0],[(sin(-angle - 45) + cos(-angle - 45)) * radius, 0, 0]], paths = [[0, 1, 2]]);
#polygon(points = [[radius * -cos(-angle / 2), radius * sin(-angle / 2), 0],[radius * -cos(-angle / 2), radius * -sin(-angle / 2), 0],[(sin(-angle - 45) + cos(-angle - 45)) * radius, 0, 0]], paths = [[0, 1, 2]]);
#polygon(points = [[radius * sin(-angle / 2), radius * cos(-angle / 2), 0],[radius * sin(-angle / 2), radius * -cos(-angle / 2), 0],[(sin(-angle - 45) + cos(-angle - 45)) * radius, 0, 0]], paths = [[0, 1, 2]]);
*/
}
module test_teardrop(){
translate([0, -15, 0]) teardrop(5, 20, 90);
translate([0, 0, 0]) teardrop(5, 20, 60);
translate([0, 15, 0]) teardrop(5, 20, 45);
}
//test_teardrop();
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